Investigation of Combined Flat Coining and Fine Blanking of 16MnCr5 to Influence the Die Roll Formation

Schweinshaupt, F.; Weiser, Ingo Felix; Herrig, T.; Bergs, Thomas

doi:10.1007/978-3-030-78424-9_13

Cited by 1 publication

(2 citation statements)

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“…The higher die roll of the form elements in comparison to S700MC is due to the lower yield strength ratio of HMnS [9]. The observed die roll reduction with increasing pre-hardening of the HMnS confirms the results of previous works [26]. The investigation on fine blanking of pre-hardened HMnS has shown that a combination of process-immanent high sheared surface hardening and increased yield strength with simultaneous optimal functional surface quality is achievable.…”

Section: Fine Blanked Part Characteristics (A)supporting

confidence: 82%

“…Investigations on fine blanking of TRIP steel also revealed large tear-off heights of 40% of the sheet thickness at the sheared surfaces [25]. In a study on fine blanking of flat coined case-hardening steel 16MnCr5 (1.7131), the die roll formation was reduced due to a forming-induced increase in the strength values [26]. In fine blanking of conventional steels, the sheared surface hardening has a positive effect on the behavior of tribologically stressed functional surfaces and thus shows potential for substituting heat treatment.…”

Section: Introductionmentioning

confidence: 99%

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Fine blanking of pre-hardened high manganese steel to investigate the sheared surface hardening and part quality

SCHWEINSHAUPT

2023

Materials Research Proceedings

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Abstract. Fine blanking is a highly productive process for manufacturing of high accuracy sheet metal parts with functional surfaces. The specific process characteristic leads to high forming in the shear zone and an associated strain hardening of the sheared functional surfaces. Utilization of the process-immanent sheared surface hardening can reduce time and resources of downstream heat treatment processes such as case hardening. High Manganese Steels (HMnS) are characterized by a high strain hardening capacity due to the deformation mechanisms of twinning and transformation induced plasticity occurring during forming. As a result of high tensile strengths, HMnS are suitable as lightweight materials, but often exhibit a relatively low yield strength in terms of structural design features. One approach for increasing the strength values without changing the alloy design is a forming-induced strain hardening of the semi-finished sheet metal by means of upsetting. Therefore, this paper deals with an experimental investigation of the influence of pre-hardening on the blanked part properties during fine blanking of HMnS X40MnCrAlV19-2 LY (1.7401). For this purpose, sheet blanks were strain hardened by means of flat coining and subsequently fine blanked with an analog geometry representing tribologically stressed functional surfaces. Relevant functional surfaces were then analyzed by means of microhardness measurements with regard to the sheared surface hardening as well as characterized in terms of the quality-determining attributes die roll and clean-shear area. Due to the deformation mechanism of twinning, fine blanking of pre-hardened HMnS resulted in a combination of process-immanent high sheared surface hardening and increased yield strength with simultaneous optimal functional surface quality.

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Section: Fine Blanked Part Characteristics (A)supporting

confidence: 82%

Section: Introductionmentioning

confidence: 99%